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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dea41d349e10311b6b5d2f148baa6d74505ad1b2792c3896b24cd9104d2164a' 
  AND token = 'aHVOJLlfFJ5LbaIqKid57XnAG5ZkoA/OU8iJookMJ64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}